Through his work at Springer Verlag, Rosbaud knew much of the scientific community in
Germany, and as a presumed
Nazi, he had sources of vital intelligence relating to weaponry. In 1935 he began to work for the journal
Naturwissenschaften. In 1938, he and his Jewish wife Hilde, and their only daughter Angela, went to the UK to avoid Nazi harassment. Rosbaud was invited to stay in the UK, but he decided to keep working in Germany to undermine the Nazi regime. In addition to his own family, Rosbaud helped a number of other Jewish families flee the Nazis, including that of the well known physicist
Lise Meitner. He was assisted in his work saving Jews by the fact that he was being run as a British agent by
Frank Foley, the MI6 station chief in Berlin. , was one of Rosbaud's contacts in Oslo. Goldschmidt was of Jewish and Bohemian background and in 1942 narrowly escaped deportation to Auschwitz. Before the outbreak of war, Rosbaud hurried into print
Otto Hahn's work on
nuclear fission in the German science journal
Naturwissenschaften in January 1939. Rosbaud realized the vast destructive potential of what Hahn, Strassmann and Meitner had discovered, and he was acutely aware that the fundamental research had been done in Germany. He wanted the rest of the world to be aware of the significance of the work at least as soon as the Nazi planners did. By rushing Hahn's manuscript into print he was able to alert the physics community worldwide. During the German occupation of Norway, Rosbaud visited Oslo in German uniform and met Professor
Tom Barth, who had connections with the resistance movement. Among the reports Rosbaud supplied to the British was that Germany was producing
V2 rockets, and that the German project to develop a nuclear bomb was not successful. Rosbaud has also been connected to the "
Oslo report", a detailed list of new German weapons systems, but this seems to have been the work of
Hans Ferdinand Mayer, technical director at
Siemens. Many of his intelligence reports were smuggled out of Germany by couriers working for the Norwegian intelligence organisation
XU. Norwegians who were studying at technical schools in Germany, such as
Sverre Bergh, linked up with Rosbaud and transported the intelligence to occupied Norway, and from there it was sent to neutral Sweden. One daring route involved a flight from Berlin to Oslo, with airport mechanics at each end helping to hide microfilms on the plane. Rosbaud supplied
Moe Berg and Horace Calvert with a list of scientists in the Russian sector of Berlin when scientists were sought to join the victors after the war. ==Pergamon Press co-founder and editor==